Intermediate gear fixed to a machine frame



May 25, 1948. A. BECHLER INTERIEDIATE GEAR FIXED TO A MACHINE FRAME Filed April 16, 1945 Patented May 25, 1948 OFFICE INTERMEDIATE GEAR FIXED TO A MACHINE FRADIE Andr Bechler, Moutier, Switzerland Application April 16, 1945, Serial No. 588,627 In Switzerland April 24, 1944 (C1. i l-4242.10)

3 Claims. 1

This invention relates to an intermediate gear fixed to a machine.

There are cases in which an intermediate gear is driven by an endless strap e. g., of trapezoidal cross section, while this gear drives an axle by means of a similar strap, These straps cannot be shortened before the expiration of a certain time of use during which they have been lengthened. It is not convenient to use idlers for tightening such straps. Therefore the only possibility remaining up till now was to displace the axles lying before and after the intermediate gear, in that the lengthening of the straps depends on their initial length and, therefore, varies from one strap to another.

This invention relates to an intermediate gear fixed to the frame of a machine, which allows to solve most of the problems of adapting endless straps running over this gear, in that it comprises two discs destined to be disposed on each side of a frame wall of the machine, this wall having an opening traversed by fixing means of the discs, preferably by a rod. This opening is of such a size that the position of the axle of the intermediate gear can be adapted to the variable length of two straps running over the gear and forming an angle between them. This adaptation can take place whatever the differences in the elongation of the straps resulting.

from use may be. Generally a fixing rod coaxial to the axle of the intermediate gear is used. In small machines it might form the axle itself of this gear. The pulleys maybe arranged either on one side or be distributed on both sides of the wall traversed.

The accompanying drawing illustrates, by way of example, one embodiment of the object of invention.

Fig. 1 is a general view of this example, and

Fig. 2 is an axial section through the intermediate gear, on a larger scale.

In this example it is a question of a machine tool with individual drive by means of an electric motor, To the frame IU of the machine a bracket H is fixed, carrying a motor l2 whose pulley I3 takes along an intermediate gear I5 by means of an endless strap I4 with trapezoidal cross section. Over another step of the gear runs a strap I6 driving a pulley l'l fixed to the main-shaft I8 of the machine.

The intermediate gear l5 comprises two discs I9 and 20 (Fig. 2). The first one is made in one piece with the axle 2| of the gear. On this axle a step pulley 22 is rotatably mounted, by means of which the ratio required between the speed of the motor and that of the mainshaft can be adjusted.

Axle 2| is traversed by a coaxial fixing rod 23 having a thread 24 engaging a thread of the disc 20. These discs are arranged on both sides of an opening 25 which they cover entirely. This opening is, however, great enough in order to allow the rod 23 to occupy different positions which are several centimetres distant from one another, while it always remain completely covered by these discs.

Hence it follows that the axle 2| of intermediate gear can always be adjusted in such a way that the two straps l4 and I6 forming an angle between them can always be tightened with the exactness required and this independently of the differences of elongation occurring on use.

The intermediate gear might have two step pulleys placed on either side of the frame wall and connected by an axle traversing the opening 25. The fixing of the discs is then, of course, adapted accordingly.

What I claim is:

1. In a machine, a frame wall having an opening, an intermediate gear, two straps forming an angle and running over said intermediate ear, said intermediate gear comprising, an axle, two discs disposed on each side of said frame Wall, means traversing said opening, destined to fix said discs to said frame wall, said opening having such a size that said means can be radially displaced in any direction necessary to adapt the position of said axle to the variable length of said straps.

2. In a machine according to claim 1, said means being a fixing rod coaxial to said axle,

3. In a machine according to claim 1 said intermediate gear comprising step pulleys arranged on the same side of said frame Wall.

ANDRE BECI-ILER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 298,291 Cromie May 6, 1884 776,170 Burkhardt Nov. 29, 1904 1,978,526 Eppler, Jr. Oct. 30, 1934 

